Mr. VL's Non-Math Blog
Thoughts, opinions, and ideas about Mathematics from a retired teacher.
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Derivation of Quadratic Formula
Monday, November 17, 2014
A quick GeoGebra-based illusion
This sketch was created to show how easily our eyes and brain can mislead us.
A simple rotation is perceived differently if key anchor segments are removed.
The complete file is
David Van Leeuwen
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